Answer true or false. Plastics are heavier than metals.

Why the molecules of a liquid lying near the free surface possess extra energy ?

The molecules of a liquid possess _______ type of motions.

Which fo the following is heavier than 1 gm molecules oxygen?

Molecular forces exist between the molecules of a liquid in a container. The molecules on the surface have unequal force leading to a tension on the surface. If this is not compensated by a force, the equilibrium of the liquid will be a difficult task. This leads to an excess pressure on the surface. The nature of the meniscus can inform us of the direction of the excess pressure. The angle of contact of the liquid decided by the forces between the molecules, air and container can make the angle of contact. The direction of the excess pressure in the meniscus of a liquid of angle of contact 2pi//3 is

On the surface of the liquid in equilibrium , molecules of the liquid possess

When the adhesive force between a liquid and glass is greater than the force between the liquid molecules , the meniscus of the liquid in a capillary tube is